Grab-bucket.



O. W. GALLAHAN.

GRAB BUCKET. APJPLIOATION FILED SEPT. 13, 1907. RENEWED MAB. 6, 1911.

99?,748, Patented July 11, 911.

.2 SHEETS-SHEET 1.

WITNESSES.-

' Guy-BM. MM M I/VVE/VTOI? q. a. EMU/u.

ATTORNEY O. W. CALLAHAN.

GRAB BUCKET.

E dd M/VE/VTUI? @MMMMM ATTORNEY WITNESSES:

UNITED STATES 'PATEN T OFFICE.

OWEN w. ,G'ALLAHAN', or CLEVELAND, OHIO, assrenon TO THE ownn BUCKETCOMPANY, A CORPORATION or OHIO.

GRAB-BUCKET.

Specification of Letters Patent.

Patented July 11, 1911.

Application filed. September 13, 1907, Serial No. 392,818. Renewed March6, 1911. Serial No.612,716.

To all whom 'it' may concern;

Be it known that I, OWEN W. OALLAHAN,

a citizen of the United States, residing at Cleveland, in the, county ofCuyahoga and State of Ohio, have invented certain .new

and useful Improvements in'Grab-Buckets,

and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in'theart to which it pertains to make and use the same.

. This invention relates to grab buckets and especially to grab bucketsof the clam shell type operated on the block and falls or tackleprinciple. Y

. One of the objects of the invention is to provide a grab bucket whichhas great digging power and is strong and durable.

A further object is to provide a bucket which is operated on the'blockand tackleprinciple and has upper and lower closing blocks each providedwit of sheaves, the blocks bei g arranged and a multiplicityconnected ina manner such that all the different bights or sections of the closlngcable reeved about such sheaves have fair" leads,

and the sections extending upwardly from the .outer or end sheavesof'the lower closing block are in substantially the center [plane of thebucket, so that the bucketwill be plumb-at all times when suspended byth closing cable.

A still further object is to provide simple but effective means wherebythe bucket may be suspended and carried independently of the closingcable so that the latter may be relieved of the load' after the bucketis closed.

These'and other objects are accomplishedby my invention which maybebriefly summarized as consisting in certain novel detailsof'construc'tionand combinations andarrangements of parts which will bedescribed in the specification'and set forth in the appended claims.

In the drawings, Figure '1 is a vertical sectional view withparts inelevation, of a bucket constructed in accordance with my invention; Fig.21s aside elevation of the bucket showing more clearly therarrangementof the upper and lower closing blocks with respect to'each other andwith respect to the parts to which said blocks are respectivelyconnected.

The bucket is. provided with two jaws 1-1 which are pivotally connectedthrough the medium of a shaft 2, and hinging arms 3, which are fastenedto the inner or adja-- Great digging power is obtained with the presentbucket by reason of the fact that I employ a counterweight which isindirectly connected to thejaws, and a closing tackle including a lowerclosing block 5 and an upper closing block 16, each having amultiplicity of sheaves, the digging power being dependent upontheweight of the counter-v weight, and also the number of sheaves of theclosing tackle. By employing these parts, when the bucket isbeing closedon the material, the upper closing tackle is pulled downward, instead ofthe lower block being -pulled upward toward the upper block. In thiscase, the upper block 16 is suspended from the rod 15, and the lowerblock 5 is connected directly to the counterweight 4. In employing aconsiderable number of sheaves in the closing tackle, as in the presentcase in which the lower block has four sheaves and the upper block threesheaves, the bights of the closing cable 23 which is reeved about thesheaves, would ordinarily be inclined and. would not have fair leads,and the portions of the cable extending up-, wardly from the two outeror end sheaves of the lower block would be on'opposite sides of thecenter plane of the buoket,-withthe result that the bucket would nothangplumb. To overcome these disadvantages, the lower block 5 isinclined with respect to the counterweight and is arranged at an anglesuch that the portions of the ,cable 23 extending upwardly from the twoouter sheaves and up through the guides carried by the bucket head havefair leads and are in substantially This ar- 1 the. center plane of thebucket. rangement will be apparent from a comparison of Figs. 1 and 2.Furthermore, the'upper block is given a slightly greater inclina-' tionthan the lower block, as indicated in Fig. 2 so as to cause the sh'eavesof the upa series of lugs at the top of the counterweight and arrangedin a row at the proper inclination to accomplish the results abovestated. The cheek plates and division plates which are arranged betweenthe sheaves 6 in the usual manner extend downward into slotsbet-ween'the lugs of'the counterweight, as shown in Fig. 2.

In order that the closing tackle may be .relieved of the load of thebucket and of the material in the bucket after the bucket jaws areclosed, I have \provided the following simple and very eliectivesupporting mechanism for supporting the bucket with the jaws in closed"position. To support the bucket and its load independently of theclosing tackle, I provide bail 9 which is loosely connected to the rod15 in a manner such that there may be slight play between the two, thebail 9 having .at its ends which extend beneath the rod 15, suitablehooks 10. On the counterweight are pivotally'connected a pair of'bellcrank levers having arms 11 which are adapted to engage the hooks 10,these bell crank levers being pivoted to the counterwei htvat 1212 onopposite sides of the lower closing block 5. The bell cranks are alsoprovided with outwardly extending arms 13 which when the counterweightis raised during the closing movements of the jaws, are adapted to beengaged by spring-like members 18, on the lower ends of'depending arms14: mounted on therod lf), so as to rock the bell cranks and swing thearms 11 in position to be engaged by the hooks 10 on the bail 9. Springs19 attached to the bell cranks are adapted to bear on the top of thecounterweight 4 and rock the bell cranks so as to swing the arms 11 outof reach of the hooks 10 when the counterweight 4 is low-- ered slightlyand when the arms 13 move awaj from the members 18. The arms 14 anddownwardly projecting ends of bail 9 are held in proper relativepositions by guides 17 secured to the arms 14 and projecting on oppositesides of the bail. \Vith this construction, when the jaws are closed,the bell cranks are automatically swung to positions such that the arms11 may be engaged by the hooks 10 when the bail 9 is pulled upwardly,but when the bucket is supported independently of the bail, as when itis desired to open the buckets, and as soon-as the counterweight movesdownward slightly, the bell cranks automatically swing to positions suchthat the hooks of the opening the bail will not interfere with of thebucket jaws.

\Vhat- I claim is g 1. In agrab bucket, a pair of jaws pivotallyconnected together',a bucket head,

armsconnecting thehead to the outer poi tions of the jaws, means forgiving the bucketdigging power comprising a counterweightat'the pivotalaxis of the jaws, and

a closing tackle adapted to receive a closing per block connected to thehead and a multiple 1 sheave low-er block connected to thecounterweight, the bottom portion of the lower block being connectedtothe top portion of the counterweight, and the sheaves of the lowerblock being inclined to the axis of the counterweightat an angle suchthat the off-running portion'of the cable extend cable and including amultiple sheave upi ing upwardly from one of the end sheaves of thelower block is in substantially the center plane of the bucket.

2. In a grab bucket, a pairof jaws pivot ally connected together, abucket head, arms connecting the head to the outer portions of the jaws,a counterweight at the pivotal axis 7 of the jaws, and'a closing tackleadapted to receive a closing cable and including a. multiple sheaveupper block connected to the head, and a multiple sheave lower blockcon-- nected to the counterweight,ftlie blocks be- 1 ing relativelyskewed so as to'cause the portions of the cable between the two, blocksto have fair leads, and the bottom of the lower block and the top of thecounterweight having overlapping portions provided with alined openingsadapted to receive a connecting pin arranged at such an angle to theaxis of the counterweight that the oil running portion of .the' cableextending upwardly from one of the end sheaves of the lower block isinsubStantially the center plane of the bucket. I

3. In a grab bucket, a pair of jaws pivotally connected together, abucket head, arms connecting the head to the outer portions of the jaws,means for giving the bucket pin extending through the lugs and portionsof the block which overlap them and arranged at an angle such that theofi' running portion ofthe cableextends upwardly from one of the endsheaves of the lower block at substantially the center plane of thebucket.

4. A bucket of the type set forth, comprising two jaws pivoted at theupper central portion to a counter-weight, a block and fall arrangementconnected to said counter-weight for the purpose of closing the jawsandallowing the same to open with means such as catches connected to thecounter-weight for engaging a vertically movable. bail whereby the jaware locked in closed position in.co1nb1nation with said bail.

5. A grab bucket comprising two jaws, a counter-weight, and said jawspivoted at their upper portions thereto, a block and fall arrangementpositioned diagonal-1y with respect to said coiuiter-weight andconnected thereto, a cross-bar positioned in parallel relation to saidcounter-weightand above the counter-weight, and the block and fallarrangement connected thereto, pivotal links connecting the middle outerportions of said. buckets to said cross-bar, a vertically movable bailpivoted to said cross-bar and provided with hooked lower ends,springpressed rocker means pivoted to said Colin ter-weight and adaptedto engage said hooks for locking said jaws in closed position.

6. A grab bucket comprising two jaws, a counter-weight, and said jawspivoted at their upper portions thereto, a blockand fall arrangementpositioned diagonally with respect'to said counter-weight and connectedthereto, a cross-bar positioned in parallel relation to saidcounterrweight and above the counter-weight, and the block. and fall aryrangernent connected thereto, pivotal links connecting the middle outerportions of said buckets to said cross-bar, depending hooks pivoted tosaid cross-bar, rocker means car'- ried by said counter-weight andadapted to engage said hooks,- anddepending members secured to saidcross-bar for automatically positioning said rocker means in engagementwith said hooks,

Signed at Cleveland in the county of Cuyahoga and State of Ohio, this3rd, day

ofS'e'ptember, 1907.

OWVEN W. CALLAHAN.

Witnesses E. B. DONNELLY, W. F. DONNELLY,

